Example usage for org.bouncycastle.crypto BlockCipher BlockCipher

Introduction

In this page you can find the example usage for org.bouncycastle.crypto BlockCipher BlockCipher.

Prototype

BlockCipher

Source Link

Usage

From source file:org.panbox.core.crypto.io.AESGCMRandomAccessFileHW.java

License:Open Source License

@Override
protected void initCiphers() throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
        RandomDataGenerationException, InvalidAlgorithmParameterException, NoSuchProviderException {

    super.initCiphers();

    // TODO: This following code mixes the SunJCE AES blockcipher
    // implementation with Bouncycastle's GCMBlockCipher to improve
    // performance due to SunJCE's AES NI support. Replace this with
    // "native" BC code, as soon as they introduce AES NI support
    // themselves. For more information see
    // http://bouncy-castle.1462172.n4.nabble.com/Using-BC-AES-GCM-for-S3-td4657050.html
    this.gcmEngine = new GCMBlockCipher(new BlockCipher() {
        Cipher aes = Cipher.getInstance("AES/ECB/NoPadding", KeyConstants.PROV_SunJCE);

        public void reset() {
        }//from   w  ww  .  j av  a 2  s  . c om

        public int processBlock(byte[] in, int inOff, byte[] out, int outOff)
                throws DataLengthException, IllegalStateException {
            try {
                aes.update(in, outOff, getBlockSize(), out, outOff);
            } catch (ShortBufferException e) {
                throw new DataLengthException();
            }
            return getBlockSize();
        }

        public void init(boolean forEncryption, CipherParameters params) throws IllegalArgumentException {
            KeyParameter kp = (KeyParameter) params;
            SecretKeySpec key = new SecretKeySpec(kp.getKey(), "AES");
            try {
                aes.init(forEncryption ? Cipher.ENCRYPT_MODE : Cipher.DECRYPT_MODE, key);
            } catch (InvalidKeyException e) {
                throw new IllegalArgumentException(e);
            }
        }

        public int getBlockSize() {
            return aes.getBlockSize();
        }

        public String getAlgorithmName() {
            return aes.getAlgorithm();
        }
    });
}

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